/* ============================================================
   MULTILINGO GLOBAL — GERMAN A1 LEARNING CENTER
   Shared design system for all /self-study/* pages
   ============================================================ */
:root {
  color-scheme: light;
  --paper: #FFFFFF; --paper-warm: #F6F4EE; --ink: #14151A; --ink-soft: #585B66; --ink-faint: #6B6E77;
  --signal: #C63C2F; --signal-dark: #A32E22; --signal-soft: #F5E3E0;
  --prussian: #1B3A63; --prussian-light: #2E5487; --prussian-soft: #E4E9F1;
  --gold: #BD8A2E; --gold-soft: #F3E8D2; --green: #1E8E5A; --green-soft: #E1F2E9; --green-dark: #146B48;
  --purple: #6B4EE8; --purple-soft: #EDE9FE; --line: #E6E2D8;
  --font-display: 'Space Grotesk', sans-serif; --font-body: 'IBM Plex Sans', sans-serif; --font-mono: 'IBM Plex Mono', monospace;
  --radius-sm: 10px; --radius-md: 20px; --radius-lg: 32px;
  --shadow-sm: 0 2px 10px rgba(20,21,26,0.07); --shadow-md: 0 14px 36px rgba(20,21,26,0.10); --shadow-lg: 0 28px 70px rgba(20,21,26,0.16);
  --ease: cubic-bezier(0.16, 1, 0.3, 1); --nav-h: 78px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-body); background: var(--paper); color: var(--ink); line-height: 1.6; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 clamp(20px, 8vw, 88px); }
.band { padding: clamp(32px, 5vw, 60px) 0; }
h1, h2, h3, h4 { font-family: var(--font-display); }
.eyebrow { font-family: var(--font-mono); font-size: 0.74rem; font-weight: 600; letter-spacing: 0.04em; color: var(--signal-dark); display: inline-flex; align-items: center; gap: 10px; }
.eyebrow::before { content: ''; width: 20px; height: 1.5px; background: currentColor; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-family: var(--font-body); font-weight: 600; font-size: 0.92rem; padding: 13px 24px; border-radius: 999px; border: 1.5px solid transparent; transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease); cursor: pointer; }
.btn-primary { background: var(--signal); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--signal-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: var(--ink); color: #fff; }
.btn-sm { padding: 9px 16px; font-size: 0.82rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
footer { border-top: 1px solid var(--line); padding: 34px 0; text-align: center; color: var(--ink-faint); font-size: 0.85rem; }

/* ---------- Nav (shared across the whole site) ---------- */
.nav { position: sticky; top: 0; left: 0; right: 0; z-index: 500; height: var(--nav-h); display: flex; align-items: center; background: rgba(255,255,255,0.9); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; width: 100%; max-width: 1220px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; color: var(--ink); }
.logo-mark { height: 42px; width: auto; }
.back-link { font-size: 0.9rem; font-weight: 500; color: var(--ink-soft); }
.back-link:hover { color: var(--ink); }
.mini-nav { display: flex; align-items: center; gap: 18px; }
.mini-nav a:not(.back-link) { font-size: 0.88rem; font-weight: 500; color: var(--ink-soft); }
.mini-nav a:not(.back-link):hover { color: var(--ink); }
.nav-burger { display: none; align-items: center; justify-content: center; width: 40px; height: 40px; background: var(--paper-warm); border: 1.5px solid var(--line); border-radius: 10px; cursor: pointer; transition: border-color 0.2s, background 0.2s, transform 0.2s; flex-shrink: 0; }
.nav-burger:hover { border-color: var(--ink-soft); background: var(--line); }
.nav-burger:active { transform: scale(0.94); }
.nav-burger span { display: block; width: 18px; height: 2px; background: var(--ink); position: relative; }
.nav-burger span::before, .nav-burger span::after { content: ''; position: absolute; left: 0; width: 18px; height: 2px; background: var(--ink); transition: transform .3s; }
.nav-burger span::before { top: -6px; }
.nav-burger span::after { top: 6px; }
.mobile-panel { position: fixed; top: calc(var(--nav-h) + 8px); right: clamp(16px, 5vw, 48px); z-index: 480; width: min(240px, calc(100vw - 32px)); max-height: min(60vh, 420px); overflow-y: auto; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); transform-origin: top right; transform: translateY(-6px) scale(0.97); opacity: 0; pointer-events: none; transition: opacity 0.2s var(--ease), transform 0.2s var(--ease); padding: 8px; display: flex; flex-direction: column; gap: 2px; }
.mobile-panel.is-open { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.mobile-panel a { font-family: var(--font-display); font-size: 0.95rem; font-weight: 600; color: var(--ink); padding: 10px 12px; border-radius: 8px; transition: background 0.2s; }
.mobile-panel a:hover { background: var(--paper-warm); }
@media (max-width: 760px) {
  .nav .wrap { gap: 10px; }
  .mini-nav { gap: 10px; }
  .mini-nav a:not(.back-link) { display: none; }
  .nav-burger { display: flex; }
  .brand { font-size: 2rem; font-weight: 800; gap: 8px; white-space: nowrap; }
  .logo-mark { height: 68px !important; }
}

/* ---------- Breadcrumbs ---------- */
.study-crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 0.82rem; color: var(--ink-faint); padding: 14px 0; }
.study-crumbs a { color: var(--ink-soft); }
.study-crumbs a:hover { color: var(--signal); }
.study-crumbs .sep { color: var(--line); }
.study-crumbs .current { color: var(--ink); font-weight: 600; }

/* ---------- Level selector ---------- */
.level-select { display: flex; gap: 10px; flex-wrap: wrap; margin: 1.4rem 0; }
.level-pill { font-family: var(--font-mono); font-weight: 700; font-size: 0.92rem; padding: 10px 20px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--paper); color: var(--ink-soft); position: relative; text-decoration: none; display: inline-block; transition: background 0.2s, transform 0.2s; }
a.level-pill:hover { background: var(--prussian-soft); transform: translateY(-1px); }
.level-pill.is-active { background: var(--prussian); border-color: var(--prussian); color: #fff; }
.level-pill.is-soon { opacity: 0.55; cursor: default; }
.level-pill.is-soon .soon-tag { display: block; font-family: var(--font-body); font-weight: 600; font-size: 0.62rem; letter-spacing: 0.02em; margin-top: 2px; }

/* ---------- Hero ---------- */
.study-hero { padding: clamp(28px, 4vw, 44px) 0 clamp(20px, 3vw, 30px); background: var(--prussian-soft); text-align: center; }
.study-hero.is-left { text-align: left; }
.study-hero h1 { font-weight: 700; font-size: clamp(1.9rem, 4.4vw, 2.9rem); margin-top: 0.9rem; letter-spacing: -0.01em; }
.study-hero p { color: var(--ink-soft); font-size: clamp(1rem, 1.5vw, 1.12rem); max-width: 60ch; margin: 1rem auto 0; }
.study-hero.is-left p { margin: 1rem 0 0; }

/* ---------- Section head ---------- */
.section-head { max-width: 680px; margin-bottom: 1.8rem; }
.section-head h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); margin-top: 0.6rem; }
.section-head p { color: var(--ink-soft); margin-top: 0.6rem; font-size: 0.98rem; }

/* ---------- Dashboard 4 pillars ---------- */
.pillar-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.pillar-card { display: block; border-radius: var(--radius-lg); padding: 26px 22px; color: #fff; transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease); }
.pillar-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.pillar-card__icon { font-size: 2rem; margin-bottom: 10px; display: block; }
.pillar-card h3 { font-size: 1.15rem; margin-bottom: 6px; }
.pillar-card p { font-size: 0.86rem; opacity: 0.88; }
.pillar-card--learn { background: linear-gradient(135deg, var(--prussian), var(--prussian-light)); }
.pillar-card--practice { background: linear-gradient(135deg, #a3281c, var(--signal)); }
.pillar-card--quiz { background: linear-gradient(135deg, #a9750f, var(--gold)); }
.pillar-card--revision { background: linear-gradient(135deg, #146b48, var(--green)); }
@media (max-width: 900px) { .pillar-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .pillar-grid { grid-template-columns: 1fr; } }

/* ---------- Generic card grid (hubs) ---------- */
.hub-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.hub-card { display: block; background: var(--paper-warm); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px 22px; transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease); }
.hub-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.hub-card__icon { font-size: 1.8rem; margin-bottom: 10px; display: block; }
.hub-card h3 { font-size: 1.08rem; margin-bottom: 6px; }
.hub-card p { color: var(--ink-soft); font-size: 0.88rem; }
.hub-card .count { display: inline-block; margin-top: 10px; font-family: var(--font-mono); font-size: 0.72rem; color: var(--prussian); background: var(--prussian-soft); border-radius: 999px; padding: 3px 10px; }
@media (max-width: 900px) { .hub-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .hub-grid { grid-template-columns: 1fr; } }

/* ---------- Learning path (sequence) ---------- */
.path-seq { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 24px; max-width: 900px; }
@media (max-width: 700px) { .path-seq { grid-template-columns: 1fr; max-width: 640px; } }
.path-seq__item { display: flex; align-items: center; gap: 14px; padding: 12px 14px; border-radius: var(--radius-md); transition: background 0.2s; }
.path-seq__item:hover { background: var(--paper-warm); }
.path-seq__num { width: 30px; height: 30px; border-radius: 50%; background: var(--prussian-soft); color: var(--prussian); font-family: var(--font-mono); font-weight: 700; font-size: 0.8rem; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.path-seq__item.is-done .path-seq__num { background: var(--green); color: #fff; }
.path-seq__title { flex: 1; font-weight: 600; font-size: 0.95rem; }
.path-seq__meta { font-size: 0.76rem; color: var(--ink-faint); font-family: var(--font-mono); }

/* ---------- Lesson page ---------- */
.lesson-header { padding: 20px 0 6px; }
.lesson-header h1 { font-size: clamp(1.7rem, 3.6vw, 2.4rem); }
.lesson-header .term { display: inline-block; margin-top: 10px; font-family: var(--font-mono); font-size: 1.05rem; font-weight: 700; color: var(--prussian); background: var(--prussian-soft); border-radius: 999px; padding: 6px 16px; }
.lesson-body { max-width: 740px; }
.lesson-block { margin: 1.6rem 0; }
.lesson-block h2 { font-size: 1.2rem; margin-bottom: 0.7rem; display: flex; align-items: center; gap: 8px; }
.lesson-block p { color: var(--ink-soft); font-size: 1rem; margin-bottom: 0.8rem; }
.easy-rule { background: var(--prussian-soft); border-radius: var(--radius-md); padding: 16px 20px; font-size: 1rem; }
.easy-rule strong { color: var(--prussian); }
.memory-trick { background: var(--gold-soft); border-radius: var(--radius-md); padding: 16px 20px; }
.memory-trick strong { color: var(--gold); }
.common-mistake { background: var(--signal-soft); border-radius: var(--radius-md); padding: 16px 20px; }
.common-mistake strong { color: var(--signal-dark); }
.example-table { width: 100%; border-collapse: collapse; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-md); overflow: hidden; }
.example-table th, .example-table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
.example-table th { font-family: var(--font-mono); font-size: 0.76rem; font-weight: 700; letter-spacing: 0.02em; color: var(--ink-faint); background: var(--paper-warm); }
.example-table .de { color: var(--prussian); font-weight: 600; }
.example-table tr:last-child td { border-bottom: none; }
.example-table-wrap { overflow-x: auto; border-radius: var(--radius-md); }
.stem-ending { display: flex; align-items: baseline; gap: 2px; font-family: var(--font-mono); font-size: 1.4rem; font-weight: 700; }
.stem-ending .stem { color: var(--ink); }
.stem-ending .ending { color: var(--signal); background: var(--signal-soft); padding: 2px 6px; border-radius: 6px; }
.subtype-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.subtype-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px; }
.subtype-card .en { font-weight: 600; font-size: 0.92rem; }
.subtype-card .de { font-family: var(--font-mono); color: var(--prussian); font-size: 0.84rem; }
@media (max-width: 560px) { .subtype-grid { grid-template-columns: 1fr; } }
.related-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.related-chips a { background: var(--paper-warm); border: 1px solid var(--line); border-radius: 999px; padding: 8px 16px; font-size: 0.86rem; font-weight: 600; }
.related-chips a:hover { background: var(--prussian-soft); }
.speak-btn { display: inline-flex; align-items: center; gap: 6px; background: var(--paper); border: 1.5px solid var(--line); border-radius: 999px; padding: 6px 14px; font-size: 0.82rem; font-weight: 600; cursor: pointer; }
.speak-btn:hover { background: var(--paper-warm); }

/* Prereqs + prev/next */
.prereq-note { background: var(--purple-soft); border-radius: var(--radius-md); padding: 14px 18px; font-size: 0.9rem; color: var(--ink); margin: 1rem 0; }
.prereq-note strong { color: var(--purple); }
.lesson-pager { display: flex; justify-content: space-between; gap: 14px; margin: 2.4rem 0; border-top: 1px solid var(--line); padding-top: 1.6rem; }
.lesson-pager a { flex: 1; padding: 14px 18px; border: 1.5px solid transparent; border-radius: var(--radius-md); font-weight: 600; transition: transform 0.2s, box-shadow 0.2s; background: var(--prussian-soft); color: var(--prussian); }
.lesson-pager a:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.lesson-pager a.next { background: var(--signal-soft); color: var(--signal-dark); }
.lesson-pager .dir { display: block; font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.02em; opacity: 0.75; margin-bottom: 4px; }
.lesson-pager .next { text-align: right; }
.lesson-pager .placeholder { visibility: hidden; background: transparent; }

/* Quick check */
.quick-check { background: var(--green-soft); border-radius: var(--radius-lg); padding: 20px 22px; }
.quick-check h4 { font-size: 1rem; margin-bottom: 10px; }
.quick-check .options { display: flex; gap: 10px; flex-wrap: wrap; margin: 10px 0; }
.quick-check button.opt { background: var(--paper); border: 1.5px solid var(--line); border-radius: 999px; padding: 9px 18px; font-weight: 600; font-size: 0.88rem; cursor: pointer; }
.quick-check button.opt:hover { border-color: var(--green); }
.quick-check button.opt.is-correct { background: var(--green); color: #fff; border-color: var(--green); }
.quick-check button.opt.is-wrong { background: var(--signal); color: #fff; border-color: var(--signal); }
.quick-check .qc-feedback { font-size: 0.9rem; font-weight: 600; margin-top: 8px; min-height: 1.4em; }

/* ---------- Reading passages (tabs + continuous-paragraph text) ---------- */
.reading-tabs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.reading-tab { font: inherit; text-align: left; cursor: pointer; background: var(--paper-warm); border: 1.5px solid var(--line); border-radius: var(--radius-md); padding: 10px 16px; display: flex; flex-direction: column; gap: 2px; transition: background 0.2s, border-color 0.2s; }
.reading-tab:hover { background: var(--prussian-soft); }
.reading-tab span { font-size: 0.78rem; font-weight: 400; color: var(--ink-faint); }
.reading-tab.is-active { background: var(--prussian); border-color: var(--prussian); color: #fff; }
.reading-tab.is-active span { color: rgba(255,255,255,0.75); }
.reading-panel { display: none; }
.reading-panel.is-active { display: block; }
.reading-passage p { margin: 0 0 16px 0; }
.reading-passage p:last-of-type { margin-bottom: 0; }

/* ---------- Category watermark (subtle, behind the flashcard content) ---------- */
.vocab-content-wrap { position: relative; overflow: hidden; }
.vocab-watermark { position: absolute; top: 50%; transform: translateY(-50%); font-size: clamp(140px, 22vw, 280px); line-height: 1; opacity: 0.05; filter: grayscale(45%); pointer-events: none; z-index: 0; user-select: none; }
.vocab-watermark--left { left: clamp(-60px, -6vw, -20px); }
.vocab-watermark--right { right: clamp(-60px, -6vw, -20px); }
.vocab-content-wrap > .flash-wrap { position: relative; z-index: 1; }
@media (max-width: 640px) { .vocab-watermark { opacity: 0.04; } }

/* ---------- Flashcards ---------- */
.flash-wrap { max-width: 480px; margin: 0 auto; }
.flash-toolbar { display: flex; gap: 10px; margin-bottom: 16px; }
.flash-toolbar input { flex: 1; padding: 12px 16px; border: 1.5px solid var(--line); border-radius: 999px; font: inherit; font-size: 0.95rem; }
.flash-count { text-align: center; font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink-faint); margin-bottom: 12px; }
.flashcard { perspective: 1400px; height: 330px; cursor: pointer; }
.flashcard-inner { position: relative; width: 100%; height: 100%; transition: transform 0.5s var(--ease); transform-style: preserve-3d; }
.flashcard.is-flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face { position: absolute; inset: 0; backface-visibility: hidden; border-radius: var(--radius-lg); border: 1.5px solid var(--line); box-shadow: var(--shadow-md); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 22px; text-align: center; background: var(--paper); overflow-y: auto; }
.flashcard-face--front { background: var(--prussian-soft); }
.flashcard-face--back { transform: rotateY(180deg); background: var(--paper); justify-content: flex-start; padding: 18px; gap: 0; }
.flashcard-icon { font-size: 2.4rem; margin-bottom: 10px; flex-shrink: 0; }
.flashcard-face h3 { font-size: clamp(1.4rem, 4vw, 1.9rem); flex-shrink: 0; }
.flashcard-word-zone { width: 100%; flex-shrink: 0; background: var(--green-soft); border-radius: var(--radius-md); padding: 16px 14px; }
.flashcard-face .plural { color: var(--ink-faint); font-size: 0.82rem; margin-top: 4px; }
.flashcard-face .pron { font-family: var(--font-mono); color: var(--prussian); font-size: 0.82rem; margin-top: 8px; }
.flashcard-divider { width: 70%; height: 1px; background: var(--line); margin: 14px auto; flex-shrink: 0; }
.flashcard-examples-zone { width: 100%; background: var(--gold-soft); border-radius: var(--radius-md); padding: 12px 16px; }
.flashcard-face .hint { margin-top: 12px; font-size: 0.72rem; color: var(--ink-faint); font-family: var(--font-mono); flex-shrink: 0; }
.flashcard-face .examples { font-size: 0.82rem; color: var(--ink-soft); }
.flashcard-face .examples p { margin-bottom: 6px; line-height: 1.4; }
.flashcard-face .examples p:last-child { margin-bottom: 0; }
.flashcard-face .examples b { color: var(--ink); }
.flash-controls { display: flex; justify-content: center; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.flash-controls button { font-family: var(--font-body); font-weight: 600; font-size: 0.86rem; padding: 10px 16px; border-radius: 999px; border: 1.5px solid var(--line); background: var(--paper); cursor: pointer; transition: transform 0.2s var(--ease), background 0.2s; }
.flash-controls button:hover { background: var(--paper-warm); transform: translateY(-2px); }
.flash-controls button.is-primary { background: var(--signal); color: #fff; border-color: var(--signal); }
.flash-progress { height: 4px; background: var(--line); border-radius: 999px; margin-top: 14px; overflow: hidden; }
.flash-progress__bar { height: 100%; background: var(--signal); border-radius: 999px; transition: width 0.3s var(--ease); width: 0%; }

/* ---------- Dialogue (situational) ---------- */
.dialogue { display: flex; flex-direction: column; gap: 12px; max-width: 620px; }
.dialogue-line { display: flex; gap: 12px; }
.dialogue-line__avatar { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; flex-shrink: 0; }
.dialogue-line--a .dialogue-line__avatar { background: var(--prussian-soft); }
.dialogue-line--b .dialogue-line__avatar { background: var(--gold-soft); }
.dialogue-line__bubble { background: var(--paper-warm); border-radius: var(--radius-md); padding: 12px 16px; flex: 1; }
.dialogue-line__bubble .de { font-weight: 600; color: var(--prussian); }
.dialogue-line__bubble .en { color: var(--ink-soft); font-size: 0.88rem; margin-top: 3px; }

/* ---------- Phrase card ---------- */
.phrase-card { background: var(--paper-warm); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 16px 18px; }
.phrase-card .de { font-weight: 700; color: var(--prussian); font-size: 1.05rem; }
.phrase-card .en { color: var(--ink-soft); font-size: 0.88rem; margin-top: 3px; }
.phrase-card .use { font-size: 0.8rem; color: var(--ink-faint); margin-top: 6px; }
.phrase-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }

/* ---------- Practice / Quiz engine ---------- */
.topic-picker { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.topic-picker button { text-align: left; background: var(--paper-warm); border: 1.5px solid var(--line); border-radius: var(--radius-md); padding: 14px 16px; font-weight: 600; font-size: 0.9rem; cursor: pointer; transition: border-color 0.2s, background 0.2s; }
.topic-picker button.is-selected { border-color: var(--signal); background: var(--signal-soft); }
@media (max-width: 760px) { .topic-picker { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .topic-picker { grid-template-columns: 1fr; } }
.count-picker { display: flex; gap: 10px; margin: 16px 0 24px; }
.count-picker button { flex: 1; padding: 12px; border-radius: var(--radius-md); border: 1.5px solid var(--line); background: var(--paper); font-weight: 700; cursor: pointer; }
.count-picker button.is-selected { background: var(--prussian); color: #fff; border-color: var(--prussian); }
.quiz-progress { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink-faint); }
.quiz-card { background: var(--paper-warm); border-radius: var(--radius-lg); padding: 28px 26px; }
.quiz-card h3 { font-size: 1.2rem; margin-bottom: 18px; }
.quiz-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-options button { text-align: left; background: var(--paper); border: 1.5px solid var(--line); border-radius: var(--radius-md); padding: 14px 18px; font-size: 0.96rem; font-weight: 600; cursor: pointer; transition: border-color 0.2s, background 0.2s; }
.quiz-options button:hover { border-color: var(--prussian); }
.quiz-options button.is-correct { background: var(--green-soft); border-color: var(--green); }
.quiz-options button.is-wrong { background: var(--signal-soft); border-color: var(--signal); }
.quiz-explain { margin-top: 14px; font-size: 0.88rem; color: var(--ink-soft); background: var(--paper); border-radius: var(--radius-sm); padding: 12px 14px; display: none; }
.quiz-explain.is-visible { display: block; }
.quiz-nextbtn { margin-top: 18px; display: none; }
.quiz-nextbtn.is-visible { display: inline-flex; }
.quiz-results { text-align: center; padding: 40px 20px; }
.quiz-badge { display: inline-block; font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; padding: 10px 22px; border-radius: 999px; margin-bottom: 18px; }
.quiz-badge--pass { background: var(--green-soft); color: var(--green-dark); }
.quiz-badge--fail { background: var(--signal-soft); color: var(--signal-dark); }
.quiz-results__score { font-family: var(--font-display); font-weight: 700; font-size: 3.4rem; color: var(--signal); }
.quiz-results__pct { font-size: 1.1rem; color: var(--ink-soft); margin-bottom: 24px; }
.weak-list { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin: 16px 0; }
.weak-list a { background: var(--signal-soft); color: var(--signal-dark); border-radius: 999px; padding: 8px 16px; font-size: 0.86rem; font-weight: 600; }

/* ---------- Revision ---------- */
.revision-list { display: flex; flex-direction: column; gap: 10px; }
.revision-item { display: flex; justify-content: space-between; align-items: center; background: var(--paper-warm); border-radius: var(--radius-md); padding: 14px 18px; }
.revision-item .title { font-weight: 600; }
.revision-item .meta { font-size: 0.78rem; color: var(--ink-faint); font-family: var(--font-mono); }
.empty-state { text-align: center; color: var(--ink-faint); padding: 40px 20px; font-size: 0.92rem; }

/* ---------- Search ---------- */
.study-search { position: relative; max-width: 420px; margin: 0 auto; }
.study-search input { width: 100%; padding: 13px 20px 13px 42px; border-radius: 999px; border: 1.5px solid var(--line); font: inherit; font-size: 0.95rem; background: var(--paper); }
.study-search__icon { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--ink-faint); }
.study-search__results { position: absolute; top: calc(100% + 8px); left: 0; right: 0; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); max-height: 340px; overflow-y: auto; z-index: 50; display: none; }
.study-search__results.is-open { display: block; }
.study-search__results a { display: block; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.study-search__results a:last-child { border-bottom: none; }
.study-search__results a:hover { background: var(--paper-warm); }
.study-search__results .tag { font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700; color: var(--ink-faint); }
.study-search__empty { padding: 16px; color: var(--ink-faint); font-size: 0.88rem; text-align: center; }

@media (max-width: 640px) {
  .example-table-wrap table { min-width: 480px; }
}